On 2013-01-14 17:37, Richard Fjeld wrote:
There is one that is about -70 dB at my Minnesota qth on 3.950-60 MHz (as I
recall). It is ten KHz wide with a second 10 KHz wide signal right above it in
frequency, but about half as strong. However, I have seen times when the
second one wasn't present, or was being covered by other signals.
I see it late in the evening after 10 pm cst and it lasts non-stop, with no let
up, for hours. Other people with pan-adapters have asked about it. It
reminds me of a digital TV transmission. It is nicely shaped and stable.
I've seen similar from OTHR (over the horizon RADAR). It usually has a
well defined 20kHz bandwidth with a PRI of 10Hz.
DFing it usually suggests about 100 degrees from southern UK.
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